CVE-2026-54806: CWE-502 Deserialization of Untrusted Data in Melapress WP Activity Log
CVE-2026-54806 is a critical vulnerability in the WP Activity Log plugin by Melapress, affecting versions up to 5.6.3.1. It involves unauthenticated PHP object injection due to deserialization of untrusted data (CWE-502). The vulnerability allows an attacker to execute arbitrary code without any authentication, leading to full compromise of confidentiality, integrity, and availability.
AI Analysis
Technical Summary
This vulnerability is an unauthenticated PHP object injection in WP Activity Log versions up to 5.6.3.1. It arises from unsafe deserialization of untrusted data, classified under CWE-502. The CVSS 3.1 base score is 9.8, indicating critical severity with network attack vector, no privileges required, no user interaction, and full impact on confidentiality, integrity, and availability. No official patch or remediation level has been published yet, and no known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary code on the affected system without authentication, resulting in complete compromise of the system's confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the affected plugin and monitor for suspicious activity related to WP Activity Log. Avoid exposing the plugin to untrusted networks where possible.
CVE-2026-54806: CWE-502 Deserialization of Untrusted Data in Melapress WP Activity Log
Description
CVE-2026-54806 is a critical vulnerability in the WP Activity Log plugin by Melapress, affecting versions up to 5.6.3.1. It involves unauthenticated PHP object injection due to deserialization of untrusted data (CWE-502). The vulnerability allows an attacker to execute arbitrary code without any authentication, leading to full compromise of confidentiality, integrity, and availability.
CVSS v3.1
Score 9.8critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is an unauthenticated PHP object injection in WP Activity Log versions up to 5.6.3.1. It arises from unsafe deserialization of untrusted data, classified under CWE-502. The CVSS 3.1 base score is 9.8, indicating critical severity with network attack vector, no privileges required, no user interaction, and full impact on confidentiality, integrity, and availability. No official patch or remediation level has been published yet, and no known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary code on the affected system without authentication, resulting in complete compromise of the system's confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the affected plugin and monitor for suspicious activity related to WP Activity Log. Avoid exposing the plugin to untrusted networks where possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Patchstack
- Date Reserved
- 2026-06-16T09:21:34.477Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3280550b89be688830004e
Added to database: 6/17/2026, 11:09:09 AM
Last enriched: 6/17/2026, 11:15:31 AM
Last updated: 6/17/2026, 1:16:49 PM
Views: 7
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